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https://github.com/apache/cassandra/commit/d3ce825bf2b376fd2516e4b594ddb69037c13159
ran multiple times
org.apache.cassandra.distributed.test.trackwarnings.TombstoneCountWarningTest.failThresholdSinglePartition failed here
I didn't find any other occurrences but seems to me legit failure.
CC dcapwell as I think you were working on those and probably you will make better assessment than me.
CI: trunk
GH: 4.1
PR: trunk